For the Class of 2019, we were allowed to bring and wear our own boots if we wanted to. I know of people who wore Nikes for all of Basic. I would not bother bring your own because they will be super dirty and gross after Basic. The Nikes that were worn in Basic were generally pretty beat up at the end. Also, you probably won't be rucking in Basic at all. Just marching and running.
I found this to be flight dependent. In my flight, only priors were allowed to have their own boots.